Use BuildConfig class instead of PackageManager to get version info

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Display ringtone name on EditPreferences activity

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Flip Ringtone and Vibrate settings

Ringtone is a more important setting than Vibrate and should be
higher.

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>